Consolidated Statements of Changes in Equity (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Common Stock [Member]		Additional paid-in capital [Member]	Accumulated deficit [Member]	Series B Preferred Stock [Member]		Series C Preferred Stock [Member]		Series D Preferred Stock [Member]		Total
Balance at Dec. 31, 2017		[1]	$ 143,079	$ (140,352)		[1]		[1]		[1]	$ 2,727
Balance, shares at Dec. 31, 2017	1,483,556				27,075		741,651		750
Net loss				(5,027)							(5,027)
Issuance of common shares, warrants, Pre-fuded warrants and exercise of pre-funded warrants, net of $2,171 issuance costs	$ 4		15,805								15,809
Issuance of common shares, warrants, Pre-fuded warrants and exercise of pre-funded warrants, net of $2,171 issuance costs shares	33,873,810
Redemption of Series D Preferred Stock			(750)							[1]	(750)
Redemption of Series D Preferred Stock, shares									(750)
Conversion of Series B Preferred Stock to common shares		[1]	274			[1]					274
Conversion of Series B Preferred Stock to common shares, shares	80,620				(9,772)
Conversion of Series C Preferred Stock to common shares		[1]	936					[1]			936
Conversion of Series C Preferred Stock to common shares, shares	1,144,726						(326,436)
Exercise of Unit Purchase Option		[1]	557								557
Exercise of Unit Purchase Option, shares	111,442
Accretion of redeemable preferred shares			(438)								(438)
Redemption of Series C Preferred Stock			(3,200)								(3,200)
Redemption of Series C Preferred Stock, shares							(353,792)
Share-based compensation related to restricted stock and stock options award, net of forfeitures of 59 shares		[1]	64								64
Share-based compensation related to restricted stock and stock options award, net of forfeitures of 59 shares, shares	(119)
Balance at Sep. 30, 2018	$ 4		$ 156,327	$ (145,379)		[1]		[1]		[1]	$ 10,952
Balance, shares at Sep. 30, 2018	36,694,035				17,303		61,423

[1] Represents an amount less than $1 thousand